Question:
Which of the following materials is commonly used as closure for PET bottles?
Which of the following materials is commonly used as closure for PET bottles?
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Packaging Material Selection:
PET Bottle Bodies $\rightarrow$ Polyethylene Terephthalate (PET).
Closures Caps for PET Bottles $\rightarrow$ POLYPROPYLENE (PP) HDPE.
PET Bottle Bodies $\rightarrow$ Polyethylene Terephthalate (PET).
Closures Caps for PET Bottles $\rightarrow$ POLYPROPYLENE (PP) HDPE.
Updated On: Sep 15, 2026
- PP
- BOPP
- PET
- HDPE
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Polymer packaging closures for beverage bottles: injection-molded Polypropylene (PP) caps (and High-Density Polyethylene HDPE) are standardly utilized as screw closures for Polyethylene Terephthalate (PET) beverage and milk bottles due to superior thread flexural strength, stress-crack resistance, and living-hinge properties.
Step 2: Detailed Explanation:
In dairy and beverage packaging technology:
- PET (Polyethylene Terephthalate) Bottles: Widely used for packaging pasteurized milk, flavored milks, drinking water, and beverages.
- Closures (Screw Caps):
1. While bottle bodies are blow-molded from PET, PET itself is too rigid and prone to stress-cracking to serve as a reliable dynamic screw closure.
2. Polypropylene (PP) (A) (along with HDPE) is commonly used as the closure material for PET bottles.
3. Injection-molded PP closures provide exceptional thread strength, high heat tolerance (surviving hot-fill at $85^\circ - 90^\circ ext{C}$), excellent torque retention, and reliable elastomeric sealing against gas/liquid leaks with tamper-evident breakaway bands.
Step 3: Final Answer:
Therefore, the material commonly used as closure is PP, corresponding to option (A).
Polymer packaging closures for beverage bottles: injection-molded Polypropylene (PP) caps (and High-Density Polyethylene HDPE) are standardly utilized as screw closures for Polyethylene Terephthalate (PET) beverage and milk bottles due to superior thread flexural strength, stress-crack resistance, and living-hinge properties.
Step 2: Detailed Explanation:
In dairy and beverage packaging technology:
- PET (Polyethylene Terephthalate) Bottles: Widely used for packaging pasteurized milk, flavored milks, drinking water, and beverages.
- Closures (Screw Caps):
1. While bottle bodies are blow-molded from PET, PET itself is too rigid and prone to stress-cracking to serve as a reliable dynamic screw closure.
2. Polypropylene (PP) (A) (along with HDPE) is commonly used as the closure material for PET bottles.
3. Injection-molded PP closures provide exceptional thread strength, high heat tolerance (surviving hot-fill at $85^\circ - 90^\circ ext{C}$), excellent torque retention, and reliable elastomeric sealing against gas/liquid leaks with tamper-evident breakaway bands.
Step 3: Final Answer:
Therefore, the material commonly used as closure is PP, corresponding to option (A).
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